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style="width:1.30em;height:1.30em;vertical-align:-0.15em;fill:currentColor;overflow:hidden;"><use xlink:href="#icon-pinweishenghuo"></use></svg><span class="menu_word" style="font-size:17px"> 休闲</span><i class="fas fa-chevron-down"></i></a><ul class="menus_item_child"><li><a class="site-page child faa-parent animated-hover" href="/life/music/"><svg class="menu_icon faa-tada" aria-hidden="true" style="width:1.30em;height:1.30em;vertical-align:-0.15em;fill:currentColor;overflow:hidden;"><use xlink:href="#icon-yinle">                   </use></svg><span class="menu_word" style="font-size:17px"> 八音盒</span></a></li><li><a class="site-page child faa-parent animated-hover" href="/life/movies/"><svg class="menu_icon faa-tada" aria-hidden="true" style="width:1.30em;height:1.30em;vertical-align:-0.15em;fill:currentColor;overflow:hidden;"><use xlink:href="#icon-dianying1">                   </use></svg><span class="menu_word" style="font-size:17px"> 影院</span></a></li><li><a class="site-page child faa-parent animated-hover" href="/life/games/"><svg class="menu_icon faa-tada" aria-hidden="true" style="width:1.30em;height:1.30em;vertical-align:-0.15em;fill:currentColor;overflow:hidden;"><use xlink:href="#icon-youxishoubing">                   </use></svg><span class="menu_word" style="font-size:17px"> 游戏</span></a></li></ul></div><div class="menus_item"><a class="site-page group faa-parent animated-hover hide" href="javascript:void(0);"><svg class="menu_icon faa-tada" aria-hidden="true" style="width:1.30em;height:1.30em;vertical-align:-0.15em;fill:currentColor;overflow:hidden;"><use xlink:href="#icon-xiangzi"></use></svg><span class="menu_word" style="font-size:17px"> 八宝箱</span><i class="fas fa-chevron-down"></i></a><ul class="menus_item_child"><li><a class="site-page child faa-parent animated-hover" href="/box/gallery/"><svg class="menu_icon faa-tada" aria-hidden="true" style="width:1.30em;height:1.30em;vertical-align:-0.15em;fill:currentColor;overflow:hidden;"><use xlink:href="#icon-tubiaozhizuomoban">                   </use></svg><span class="menu_word" style="font-size:17px"> 画廊</span></a></li><li><a class="site-page child faa-parent animated-hover" href="/box/animation/"><svg class="menu_icon faa-tada" aria-hidden="true" style="width:1.30em;height:1.30em;vertical-align:-0.15em;fill:currentColor;overflow:hidden;"><use xlink:href="#icon-nvwumao">                   </use></svg><span class="menu_word" style="font-size:17px"> 动画</span></a></li><li><a class="site-page child faa-parent animated-hover" href="/box/nav/"><svg class="menu_icon faa-tada" aria-hidden="true" style="width:1.30em;height:1.30em;vertical-align:-0.15em;fill:currentColor;overflow:hidden;"><use xlink:href="#icon-zhifengche">                   </use></svg><span class="menu_word" style="font-size:17px"> 网址导航</span></a></li></ul></div><div class="menus_item"><a class="site-page group faa-parent animated-hover hide" href="javascript:void(0);"><svg class="menu_icon faa-tada" aria-hidden="true" style="width:1.30em;height:1.30em;vertical-align:-0.15em;fill:currentColor;overflow:hidden;"><use xlink:href="#icon-shejiaoxinxi"></use></svg><span class="menu_word" style="font-size:17px"> 社交</span><i class="fas fa-chevron-down"></i></a><ul class="menus_item_child"><li><a class="site-page child faa-parent animated-hover" href="/social/fcircle/"><svg class="menu_icon faa-tada" aria-hidden="true" style="width:1.30em;height:1.30em;vertical-align:-0.15em;fill:currentColor;overflow:hidden;"><use xlink:href="#icon-pengyouquan">                   </use></svg><span class="menu_word" style="font-size:17px"> 朋友圈</span></a></li><li><a class="site-page child faa-parent animated-hover" href="/comments/"><svg class="menu_icon faa-tada" aria-hidden="true" style="width:1.30em;height:1.30em;vertical-align:-0.15em;fill:currentColor;overflow:hidden;"><use xlink:href="#icon-liuyan">                   </use></svg><span class="menu_word" style="font-size:17px"> 留言板</span></a></li><li><a class="site-page child faa-parent animated-hover" href="/social/link/"><svg class="menu_icon faa-tada" aria-hidden="true" style="width:1.30em;height:1.30em;vertical-align:-0.15em;fill:currentColor;overflow:hidden;"><use xlink:href="#icon-lianjie">                   </use></svg><span class="menu_word" style="font-size:17px"> 友人帐</span></a></li></ul></div><div class="menus_item"><a class="site-page group faa-parent animated-hover hide" href="javascript:void(0);"><svg class="menu_icon faa-tada" aria-hidden="true" style="width:1.30em;height:1.30em;vertical-align:-0.15em;fill:currentColor;overflow:hidden;"><use xlink:href="#icon-wangye"></use></svg><span class="menu_word" style="font-size:17px"> 网站</span><i class="fas fa-chevron-down"></i></a><ul class="menus_item_child"><li><a class="site-page child faa-parent animated-hover" href="/site/census/"><svg class="menu_icon faa-tada" aria-hidden="true" style="width:1.30em;height:1.30em;vertical-align:-0.15em;fill:currentColor;overflow:hidden;"><use xlink:href="#icon--tongjibiao">                   </use></svg><span class="menu_word" style="font-size:17px"> 网站统计</span></a></li><li><a class="site-page child faa-parent animated-hover" href="/site/echarts/"><svg class="menu_icon faa-tada" aria-hidden="true" style="width:1.30em;height:1.30em;vertical-align:-0.15em;fill:currentColor;overflow:hidden;"><use xlink:href="#icon-shujutongji1">                   </use></svg><span class="menu_word" style="font-size:17px"> 文章统计</span></a></li><li><a class="site-page child faa-parent animated-hover" href="/site/time/"><svg class="menu_icon faa-tada" aria-hidden="true" style="width:1.30em;height:1.30em;vertical-align:-0.15em;fill:currentColor;overflow:hidden;"><use xlink:href="#icon-xianxingshalou">                   </use></svg><span class="menu_word" style="font-size:17px"> 旧时光</span></a></li></ul></div><div class="menus_item"><a class="site-page group faa-parent animated-hover hide" href="javascript:void(0);"><svg class="menu_icon faa-tada" aria-hidden="true" style="width:1.30em;height:1.30em;vertical-align:-0.15em;fill:currentColor;overflow:hidden;"><use xlink:href="#icon-maoliang"></use></svg><span class="menu_word" style="font-size:17px"> 个人</span><i class="fas fa-chevron-down"></i></a><ul class="menus_item_child"><li><a class="site-page child faa-parent animated-hover" href="/personal/bb/"><svg class="menu_icon faa-tada" aria-hidden="true" style="width:1.30em;height:1.30em;vertical-align:-0.15em;fill:currentColor;overflow:hidden;"><use xlink:href="#icon-qunliaotian">                   </use></svg><span class="menu_word" style="font-size:17px"> 唠叨</span></a></li><li><a class="site-page child faa-parent animated-hover" href="/personal/love/"><svg class="menu_icon faa-tada" aria-hidden="true" style="width:1.30em;height:1.30em;vertical-align:-0.15em;fill:currentColor;overflow:hidden;"><use xlink:href="#icon-love-sign">                   </use></svg><span class="menu_word" style="font-size:17px"> 恋爱小屋</span></a></li><li><a class="site-page child faa-parent animated-hover" href="/personal/about/"><svg class="menu_icon faa-tada" aria-hidden="true" style="width:1.30em;height:1.30em;vertical-align:-0.15em;fill:currentColor;overflow:hidden;"><use xlink:href="#icon-paperplane">                   </use></svg><span class="menu_word" style="font-size:17px"> 关于</span></a></li><li><a class="site-page child faa-parent animated-hover" href="/encryption/%E6%9C%BA%E5%9C%BA/"><svg class="menu_icon faa-tada" aria-hidden="true" style="width:1.30em;height:1.30em;vertical-align:-0.15em;fill:currentColor;overflow:hidden;"><use xlink:href="#icon-paperplane">                   </use></svg><span class="menu_word" style="font-size:17px"> 机场</span></a></li></ul></div></div><center id="name-container"><a id="page-name" href="javascript:scrollToTop()">PAGE_NAME</a></center><div id="nav-right"><div id="search-button"><a class="search faa-parent animated-hover" title="检索站内任何你想要的信息"><svg class="faa-tada icon" style="height:24px;width:24px;fill:currentColor;position:relative;top:6px" aria-hidden="true"><use xlink:href="#icon-valentine_-search-love-find-heart"></use></svg><span> 搜索</span></a></div><a class="meihua faa-parent animated-hover" onclick="toggleWinbox()" title="美化设置-自定义你的风格" id="meihua-button"><svg class="faa-tada icon" style="height:26px;width:26px;fill:currentColor;position:relative;top:8px" aria-hidden="true"><use xlink:href="#icon-tupian1"></use></svg></a><a class="sun_moon faa-parent animated-hover" onclick="switchNightMode()" title="浅色和深色模式转换" id="nightmode-button"><svg class="faa-tada" style="height:25px;width:25px;fill:currentColor;position:relative;top:7px" viewBox="0 0 1024 1024"><use id="modeicon" xlink:href="#icon-moon">       </use></svg></a><div id="toggle-menu"><a><i class="fas fa-bars fa-fw"></i></a></div></div></div></nav><div id="post-info"><h1 class="post-title">vue3</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><svg class="meta_icon post-meta-icon" style="width:30px;height:30px;position:relative;top:10px"><use xlink:href="#icon-rili"></use></svg><span class="post-meta-label">发表于 </span><time class="post-meta-date-created" datetime="2023-05-10T07:18:51.000Z" title="发表于 2023-05-10 15:18:51">2023-05-10</time><span class="post-meta-separator">|</span><svg class="meta_icon post-meta-icon" style="width:18px;height:18px;position:relative;top:5px"><use xlink:href="#icon-gengxin1"></use></svg><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2024-04-26T09:52:19.008Z" title="更新于 2024-04-26 17:52:19">2024-04-26</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><svg class="meta_icon post-meta-icon" style="width:18px;height:18px;position:relative;top:5px"><use xlink:href="#icon-biaoqian"></use></svg><a class="post-meta-categories" href="/categories/%E5%89%8D%E7%AB%AF/">前端</a><i class="fas fa-angle-right post-meta-separator"></i><svg class="meta_icon post-meta-icon" style="width:18px;height:18px;position:relative;top:5px"><use xlink:href="#icon-biaoqian"></use></svg><a class="post-meta-categories" href="/categories/%E5%89%8D%E7%AB%AF/%E6%A1%86%E6%9E%B6/">框架</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><svg class="meta_icon post-meta-icon" style="width:25px;height:25px;position:relative;top:8px"><use xlink:href="#icon-charuword"></use></svg><span class="post-meta-label">字数总计:</span><span class="word-count">2602</span><span class="post-meta-separator">|</span><svg class="meta_icon post-meta-icon" style="width:20px;height:20px;position:relative;top:5px"><use xlink:href="#icon-shizhong"></use></svg><span class="post-meta-label">阅读时长:</span><span>11分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="vue3"><svg class="meta_icon post-meta-icon" style="width:25px;height:25px;position:relative;top:5px"><use xlink:href="#icon-eye"></use></svg><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div><section class="main-hero-waves-area waves-area"><svg class="waves-svg" xmlns="http://www.w3.org/2000/svg" xlink="http://www.w3.org/1999/xlink" viewBox="0 24 150 28" preserveAspectRatio="none" shape-rendering="auto"><defs><path id="gentle-wave" d="M -160 44 c 30 0 58 -18 88 -18 s 58 18 88 18 s 58 -18 88 -18 s 58 18 88 18 v 44 h -352 Z"></path></defs><g class="parallax"><use href="#gentle-wave" x="48" y="0"></use><use href="#gentle-wave" x="48" y="3"></use><use href="#gentle-wave" x="48" y="5"></use><use href="#gentle-wave" x="48" y="7"></use></g></svg></section></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h1 id="目录"><a href="#目录" class="headerlink" title="目录"></a>目录</h1><p>[TOC]</p>
<h1 id="安装及项目初始化"><a href="#安装及项目初始化" class="headerlink" title="安装及项目初始化"></a>安装及项目初始化</h1><h2 id="认识create-vue"><a href="#认识create-vue" class="headerlink" title="认识create-vue"></a>认识create-vue</h2><blockquote>
<p><strong>create-vue是Vue官方新的脚手架工具，底层切换到了 vite （下一代前端工具链），为开发提供极速响应</strong></p>
</blockquote>
<p><img src= "" data-lazy-src="https://www.naste.top:9000/images/1678178479590-ac164009-4a72-4448-85bf-67dc13f3d0c4.png" alt="image.png"></p>
<h2 id="使用create-vue创建项目"><a href="#使用create-vue创建项目" class="headerlink" title="使用create-vue创建项目"></a>使用create-vue创建项目</h2><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta prompt_"># </span><span class="language-bash">前置条件 - 已安装16.0或更高版本的Node.js</span></span><br><span class="line"><span class="meta prompt_"></span></span><br><span class="line"><span class="meta prompt_"># </span><span class="language-bash">执行如下命令，这一指令将会安装并执行 create-vue</span></span><br><span class="line">npm init vue@latest</span><br></pre></td></tr></table></figure>
<p><img src= "" data-lazy-src="https://www.naste.top:9000/images/1678178685782-71a3b311-423d-4528-aae9-85e6068db452.png" alt="image.png"></p>
<h1 id="熟悉项目和关键文件"><a href="#熟悉项目和关键文件" class="headerlink" title="熟悉项目和关键文件"></a>熟悉项目和关键文件</h1><p><img src= "" data-lazy-src="https://www.naste.top:9000/images/1678178749511-f4a42cbf-987b-46a7-9a01-9cd4f00a5fcf.png" alt="image.png"></p>
<h1 id="语法"><a href="#语法" class="headerlink" title="语法"></a>语法</h1><h2 id="setup"><a href="#setup" class="headerlink" title="setup"></a>setup</h2><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!-- setup写法 --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">setup</span>&gt;</span><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> message = <span class="string">&#x27;this is message&#x27;</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> <span class="title function_">logMessage</span> = (<span class="params"></span>) =&gt; &#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="variable language_">console</span>.<span class="title function_">log</span>(message)</span></span><br><span class="line"><span class="language-javascript">&#125;</span></span><br><span class="line"><span class="language-javascript"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br></pre></td></tr></table></figure>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!-- 旧版本写法 --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">script</span>&gt;</span><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">export</span> <span class="keyword">default</span> &#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="title function_">setup</span>(<span class="params"></span>) &#123;</span></span><br><span class="line"><span class="language-javascript">    <span class="keyword">const</span> message = <span class="string">&#x27;this is message&#x27;</span></span></span><br><span class="line"><span class="language-javascript">    <span class="keyword">const</span> <span class="title function_">logMessage</span> = (<span class="params"></span>) =&gt; &#123;</span></span><br><span class="line"><span class="language-javascript">      <span class="variable language_">console</span>.<span class="title function_">log</span>(message)</span></span><br><span class="line"><span class="language-javascript">    &#125;</span></span><br><span class="line"><span class="language-javascript">    <span class="comment">// 必须return才可以</span></span></span><br><span class="line"><span class="language-javascript">    <span class="keyword">return</span> &#123;</span></span><br><span class="line"><span class="language-javascript">      message,</span></span><br><span class="line"><span class="language-javascript">      logMessage</span></span><br><span class="line"><span class="language-javascript">    &#125;</span></span><br><span class="line"><span class="language-javascript">  &#125;</span></span><br><span class="line"><span class="language-javascript">&#125;</span></span><br><span class="line"><span class="language-javascript"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br></pre></td></tr></table></figure>
<h2 id="reactive和ref函数"><a href="#reactive和ref函数" class="headerlink" title="reactive和ref函数"></a>reactive和ref函数</h2><h3 id="reactive"><a href="#reactive" class="headerlink" title="reactive"></a>reactive</h3><blockquote>
<p><strong>接受对象类型数据的参数传入并返回一个响应式的对象接受对象类型数据的参数传入并返回一个响应式的对象</strong></p>
</blockquote>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">setup</span>&gt;</span><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// reactive只能支持对象类型</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">import</span> &#123;reactive&#125; <span class="keyword">from</span> <span class="string">&quot;vue&quot;</span>;</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// reactive里面定义各种属性</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> person = <span class="title function_">reactive</span>(&#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="attr">id</span>: <span class="number">0</span>,</span></span><br><span class="line"><span class="language-javascript">  <span class="attr">username</span>: <span class="string">&#x27;XiaoFei&#x27;</span>,</span></span><br><span class="line"><span class="language-javascript">  <span class="attr">age</span>: <span class="number">18</span></span></span><br><span class="line"><span class="language-javascript">&#125;)</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 创建一个函数</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> <span class="title function_">addAge</span> = (<span class="params"></span>) =&gt; &#123;</span></span><br><span class="line"><span class="language-javascript">  person.<span class="property">age</span>++</span></span><br><span class="line"><span class="language-javascript">&#125;</span></span><br><span class="line"><span class="language-javascript"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">template</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">div</span>&gt;</span>person对象信息：&#123;&#123; person &#125;&#125;<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">button</span> @<span class="attr">click</span>=<span class="string">&quot;addAge&quot;</span>&gt;</span>点击添加年龄：&#123;&#123; person.age &#125;&#125;<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">template</span>&gt;</span></span><br><span class="line"></span><br></pre></td></tr></table></figure>
<h3 id="ref"><a href="#ref" class="headerlink" title="ref"></a>ref</h3><blockquote>
<p><strong>接收简单类型或者对象类型的数据传入并返回一个响应式的对象</strong></p>
</blockquote>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">setup</span>&gt;</span><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// ref 函数可以接收普通类型，也可以接收对象，ref定义的，需要在获取的时候 .value</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">import</span> &#123;ref&#125; <span class="keyword">from</span> <span class="string">&quot;vue&quot;</span>;</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// ref接收普通类型值</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> count = <span class="title function_">ref</span>(<span class="number">0</span>)</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// ref接收对象类型值</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> person = <span class="title function_">ref</span>(&#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="attr">id</span>: <span class="number">0</span>,</span></span><br><span class="line"><span class="language-javascript">  <span class="attr">username</span>: <span class="string">&#x27;XiaoFei&#x27;</span>,</span></span><br><span class="line"><span class="language-javascript">  <span class="attr">age</span>: <span class="number">18</span></span></span><br><span class="line"><span class="language-javascript">&#125;)</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 定义一个函数</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> <span class="title function_">addCount</span> = (<span class="params"></span>) =&gt; &#123;</span></span><br><span class="line"><span class="language-javascript">  count.<span class="property">value</span>++</span></span><br><span class="line"><span class="language-javascript">&#125;</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 定义函数</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> <span class="title function_">addAge</span> = (<span class="params"></span>) =&gt; &#123;</span></span><br><span class="line"><span class="language-javascript">  person.<span class="property">value</span>.<span class="property">age</span>++</span></span><br><span class="line"><span class="language-javascript">&#125;</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">template</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">div</span>&gt;</span>普通类型值<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">div</span>&gt;</span>count：&#123;&#123; count &#125;&#125;<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">button</span> @<span class="attr">click</span>=<span class="string">&quot;addCount&quot;</span>&gt;</span>点击添加<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span><br><span class="line"></span><br><span class="line">  <span class="tag">&lt;<span class="name">div</span>&gt;</span>传入对象<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">div</span>&gt;</span>person：&#123;&#123; person &#125;&#125;<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">button</span> @<span class="attr">click</span>=<span class="string">&quot;addAge&quot;</span>&gt;</span>点击添加<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">template</span>&gt;</span></span><br></pre></td></tr></table></figure>
<h3 id="reactive对比ref"><a href="#reactive对比ref" class="headerlink" title="reactive对比ref"></a>reactive对比ref</h3><ul>
<li>都是用来生成响应式数据</li>
<li>不同点<ul>
<li>reactive不能处理简单类型的数据</li>
<li>ref参数类型支持更好，但是必须通过.value做访问修改</li>
<li>ref函数内部的实现依赖于reactive函数</li>
</ul>
</li>
<li>在实际工作中的推荐<ul>
<li>推荐使用ref函数，减少记忆负担</li>
</ul>
</li>
</ul>
<h2 id="computed"><a href="#computed" class="headerlink" title="computed"></a>computed</h2><ul>
<li>计算属性中不应该有“副作用”，<strong>比如异步请求 / 修改dom</strong></li>
<li>避免直接修改计算属性中的值，<strong>计算属性应该只读的</strong></li>
</ul>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">setup</span>&gt;</span><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 导入</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">import</span> &#123;ref, computed&#125; <span class="keyword">from</span> <span class="string">&#x27;vue&#x27;</span></span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 原始数据</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> list = <span class="title function_">ref</span>([<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>])</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 计算属性后数据</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> computedList = <span class="title function_">computed</span>(<span class="function">() =&gt;</span> &#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="comment">// 返回数组中 &gt; 2的值</span></span></span><br><span class="line"><span class="language-javascript">  <span class="keyword">return</span> list.<span class="property">value</span>.<span class="title function_">filter</span>(<span class="function"><span class="params">item</span> =&gt;</span> item &gt; <span class="number">2</span>)</span></span><br><span class="line"><span class="language-javascript">&#125;)</span></span><br><span class="line"><span class="language-javascript"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">template</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">div</span>&gt;</span> 原始数据 —— &#123;&#123; list &#125;&#125; <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">div</span>&gt;</span> 计算属性数据 —— &#123;&#123; computedList &#125;&#125; <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">template</span>&gt;</span></span><br><span class="line"></span><br></pre></td></tr></table></figure>
<h2 id="watch"><a href="#watch" class="headerlink" title="watch"></a>watch</h2><blockquote>
<p><strong>属性监听，当属性的值改变时，触发watch设置的函数</strong></p>
</blockquote>
<h3 id="监听单个-多个数据"><a href="#监听单个-多个数据" class="headerlink" title="监听单个 / 多个数据"></a>监听单个 / 多个数据</h3><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">setup</span>&gt;</span><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 导入watch</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">import</span> &#123;ref, watch&#125; <span class="keyword">from</span> <span class="string">&#x27;vue&#x27;</span></span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> count = <span class="title function_">ref</span>(<span class="number">0</span>)</span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> age = <span class="title function_">ref</span>(<span class="number">0</span>)</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> <span class="title function_">addCountAndAge</span> = (<span class="params"></span>) =&gt; &#123;</span></span><br><span class="line"><span class="language-javascript">  count.<span class="property">value</span>++</span></span><br><span class="line"><span class="language-javascript">  age.<span class="property">value</span>++</span></span><br><span class="line"><span class="language-javascript">&#125;</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 调用 watch 侦听单个数据变化</span></span></span><br><span class="line"><span class="language-javascript"><span class="title function_">watch</span>(count, <span class="function">(<span class="params">newValue, oldValue</span>) =&gt;</span> &#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&quot;调用 watch 侦听单个数据变化&quot;</span>)</span></span><br><span class="line"><span class="language-javascript">  <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&#x27;count&#x27;</span>, count.<span class="property">value</span>, newValue, oldValue)</span></span><br><span class="line"><span class="language-javascript">&#125;)</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 调用 watch 侦听多个数据变化【多个值使用[]接收】</span></span></span><br><span class="line"><span class="language-javascript"><span class="title function_">watch</span>([count, age], <span class="function">(<span class="params">[countNewValue, ageNewValue], [countOldValue, ageOldCount]</span>) =&gt;</span> &#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&quot;调用 watch 侦听多个数据变化&quot;</span>)</span></span><br><span class="line"><span class="language-javascript">  <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&#x27;count&#x27;</span>, count.<span class="property">value</span>, countNewValue, countOldValue)</span></span><br><span class="line"><span class="language-javascript">  <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&#x27;age&#x27;</span>, age.<span class="property">value</span>, ageNewValue, ageOldCount)</span></span><br><span class="line"><span class="language-javascript">&#125;)</span></span><br><span class="line"><span class="language-javascript"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">template</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">div</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">button</span> @<span class="attr">click</span>=<span class="string">&quot;addCountAndAge&quot;</span>&gt;</span>Count：&#123;&#123; count &#125;&#125;<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">br</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">button</span> @<span class="attr">click</span>=<span class="string">&quot;addCountAndAge&quot;</span>&gt;</span>Age：&#123;&#123; age &#125;&#125;<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">template</span>&gt;</span></span><br><span class="line"></span><br></pre></td></tr></table></figure>
<h3 id="immediate"><a href="#immediate" class="headerlink" title="immediate"></a>immediate</h3><blockquote>
<p><strong>immediate：watch的第三个参数，传入对象，immediate设置为true，会先执行一次watch的回调函数，不用等监听的属性值改变</strong></p>
</blockquote>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">setup</span>&gt;</span><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 导入watch</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">import</span> &#123;ref, watch&#125; <span class="keyword">from</span> <span class="string">&#x27;vue&#x27;</span></span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> count = <span class="title function_">ref</span>(<span class="number">0</span>)</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> <span class="title function_">addCountAndAge</span> = (<span class="params"></span>) =&gt; &#123;</span></span><br><span class="line"><span class="language-javascript">  count.<span class="property">value</span>++</span></span><br><span class="line"><span class="language-javascript">&#125;</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 调用 watch 侦听单个数据变化 ，immediate为watch的第三个参数</span></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// immediate设置为true 会先执行一次watch的回调函数，不用等监听的属性值改变</span></span></span><br><span class="line"><span class="language-javascript"><span class="title function_">watch</span>(count,<span class="function">() =&gt;</span> &#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&quot;watch回调函数执行了&quot;</span>)</span></span><br><span class="line"><span class="language-javascript">&#125;, &#123;<span class="attr">immediate</span>: <span class="literal">true</span>&#125;)</span></span><br><span class="line"><span class="language-javascript"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">template</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">div</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">button</span> @<span class="attr">click</span>=<span class="string">&quot;addCountAndAge&quot;</span>&gt;</span>Count：&#123;&#123; count &#125;&#125;<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">template</span>&gt;</span></span><br><span class="line"></span><br></pre></td></tr></table></figure>
<h3 id="deep"><a href="#deep" class="headerlink" title="deep"></a>deep</h3><blockquote>
<p><strong>通过watch监听的ref对象默认是浅层侦听的，直接修改嵌套的对象属性不会触发回调执行，需要开启deep，<code>deep开启有性能损耗，尽量不使用deep</code></strong></p>
</blockquote>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">setup</span>&gt;</span><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 导入watch</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">import</span> &#123;ref, watch&#125; <span class="keyword">from</span> <span class="string">&#x27;vue&#x27;</span></span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> person = <span class="title function_">ref</span>(&#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="attr">age</span>: <span class="number">18</span>,</span></span><br><span class="line"><span class="language-javascript">  <span class="attr">count</span>: <span class="number">1</span></span></span><br><span class="line"><span class="language-javascript">&#125;)</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> <span class="title function_">updateAge</span> = (<span class="params"></span>) =&gt; &#123;</span></span><br><span class="line"><span class="language-javascript">  person.<span class="property">value</span>.<span class="property">age</span>++</span></span><br><span class="line"><span class="language-javascript">&#125;</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> <span class="title function_">updateCount</span> = (<span class="params"></span>) =&gt; &#123;</span></span><br><span class="line"><span class="language-javascript">  person.<span class="property">value</span>.<span class="property">count</span>++</span></span><br><span class="line"><span class="language-javascript">&#125;</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 在watch的第三个参数设置  deep:true ，watch才能监听ref设置的对象属性，此时，对象中无论哪个值改变都会触发watch的回调</span></span></span><br><span class="line"><span class="language-javascript"><span class="title function_">watch</span>(</span></span><br><span class="line"><span class="language-javascript">    person,</span></span><br><span class="line"><span class="language-javascript">    <span class="function">() =&gt;</span> &#123;</span></span><br><span class="line"><span class="language-javascript">      <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&quot;person修改了&quot;</span>, person.<span class="property">value</span>)</span></span><br><span class="line"><span class="language-javascript">    &#125;,</span></span><br><span class="line"><span class="language-javascript">    &#123;<span class="attr">deep</span>: <span class="literal">true</span>&#125;</span></span><br><span class="line"><span class="language-javascript">)</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 在watch的第三个参数设置  deep:true ，watch才能监听ref设置的对象属性，此时，指定的对象中的属性的值修改了才能触发watch的回调</span></span></span><br><span class="line"><span class="language-javascript"><span class="title function_">watch</span>(</span></span><br><span class="line"><span class="language-javascript">    <span class="function">() =&gt;</span> &#123;</span></span><br><span class="line"><span class="language-javascript">      person.<span class="property">value</span>.<span class="property">age</span></span></span><br><span class="line"><span class="language-javascript">    &#125;,</span></span><br><span class="line"><span class="language-javascript">    <span class="function">() =&gt;</span> &#123;</span></span><br><span class="line"><span class="language-javascript">      <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&quot;person修改了&quot;</span>, person.<span class="property">value</span>)</span></span><br><span class="line"><span class="language-javascript">    &#125;,</span></span><br><span class="line"><span class="language-javascript">    &#123;<span class="attr">deep</span>: <span class="literal">true</span>&#125;</span></span><br><span class="line"><span class="language-javascript">)</span></span><br><span class="line"><span class="language-javascript"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">template</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">div</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">button</span> @<span class="attr">click</span>=<span class="string">&quot;updateAge&quot;</span>&gt;</span>修改age：&#123;&#123; person.age &#125;&#125;<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">br</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">button</span> @<span class="attr">click</span>=<span class="string">&quot;updateCount&quot;</span>&gt;</span>修改count：&#123;&#123; person.count &#125;&#125;<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">template</span>&gt;</span></span><br><span class="line"></span><br></pre></td></tr></table></figure>
<h1 id="生命周期函数"><a href="#生命周期函数" class="headerlink" title="生命周期函数"></a>生命周期函数</h1><blockquote>
<p><strong>选项式：vue2</strong></p>
<p><strong>组合式：vue3</strong></p>
</blockquote>
<p><img src= "" data-lazy-src="https://www.naste.top:9000/images/1678183720098-4d40e806-bc0d-4c38-bcbe-9aed440f6b23.png" alt="image.png"></p>
<blockquote>
<p><strong>使用import从vue中引入各个需要使用的生命周期函，同一个生命周期函数可以同时使用多次，该情况应用场景<code>如果接收别人写的项目，不改动别人的代码，在他前面执行新的功能，可以同时使用相同的生命周期函数在他前/后执行即可</code></strong></p>
</blockquote>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">setup</span>&gt;</span><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 生命周期</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">import</span> &#123;onBeforeMount, onMounted, onBeforeUpdate, onUpdated, onBeforeUnmount, onUnmounted&#125; <span class="keyword">from</span> <span class="string">&#x27;vue&#x27;</span></span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="title function_">onBeforeMount</span>(<span class="function">() =&gt;</span> &#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&quot;onBeforeMount1&quot;</span>)</span></span><br><span class="line"><span class="language-javascript">&#125;)</span></span><br><span class="line"><span class="language-javascript"><span class="comment">//同一个生命周期函数可以同时写多个，会按照顺序执行</span></span></span><br><span class="line"><span class="language-javascript"><span class="title function_">onBeforeMount</span>(<span class="function">() =&gt;</span> &#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&quot;onBeforeMount2&quot;</span>)</span></span><br><span class="line"><span class="language-javascript">&#125;)</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="title function_">onMounted</span>(<span class="function">() =&gt;</span> &#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&quot;onMounted&quot;</span>)</span></span><br><span class="line"><span class="language-javascript">&#125;)</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="title function_">onBeforeUpdate</span>(<span class="function">() =&gt;</span> &#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&quot;onBeforeUpdate&quot;</span>)</span></span><br><span class="line"><span class="language-javascript">&#125;)</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="title function_">onUpdated</span>(<span class="function">() =&gt;</span> &#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&quot;onUpdated&quot;</span>)</span></span><br><span class="line"><span class="language-javascript">&#125;)</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="title function_">onBeforeUnmount</span>(<span class="function">() =&gt;</span> &#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&quot;onBeforeUnmount&quot;</span>)</span></span><br><span class="line"><span class="language-javascript">&#125;)</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="title function_">onUnmounted</span>(<span class="function">() =&gt;</span> &#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&quot;onUnmounted&quot;</span>)</span></span><br><span class="line"><span class="language-javascript">&#125;)</span></span><br><span class="line"><span class="language-javascript"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br></pre></td></tr></table></figure>
<h1 id="组件间通信"><a href="#组件间通信" class="headerlink" title="组件间通信"></a>组件间通信</h1><h2 id="父传子"><a href="#父传子" class="headerlink" title="父传子"></a>父传子</h2><blockquote>
<p><strong>父组件</strong></p>
</blockquote>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">setup</span>&gt;</span><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 引入子组件</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">import</span> <span class="title class_">Son</span> <span class="keyword">from</span> <span class="string">&#x27;./Son.vue&#x27;</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">import</span> &#123;ref&#125; <span class="keyword">from</span> <span class="string">&quot;vue&quot;</span>;</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> person = <span class="title function_">ref</span>(&#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="attr">name</span>: <span class="string">&quot;XiaoFei&quot;</span>,</span></span><br><span class="line"><span class="language-javascript">  <span class="attr">age</span>: <span class="number">18</span></span></span><br><span class="line"><span class="language-javascript">&#125;)</span></span><br><span class="line"><span class="language-javascript"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">template</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">div</span>&gt;</span></span><br><span class="line">    <span class="comment">&lt;!-- 可以传入上面定义的参数 --&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">son</span> <span class="attr">:person</span>=<span class="string">&quot;person&quot;</span>/&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">template</span>&gt;</span></span><br></pre></td></tr></table></figure>
<blockquote>
<p><strong>子组件</strong></p>
</blockquote>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">template</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">div</span>&gt;</span>子组件接收的数据：&#123;&#123; props &#125;&#125;<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">template</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">setup</span>&gt;</span><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 子组件接收数据</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> props = <span class="title function_">defineProps</span>(&#123;</span></span><br><span class="line"><span class="language-javascript">    <span class="comment">//参数名:参数类型</span></span></span><br><span class="line"><span class="language-javascript">  <span class="attr">person</span>: <span class="title class_">Object</span></span></span><br><span class="line"><span class="language-javascript">&#125;)</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="variable language_">console</span>.<span class="title function_">log</span>(props.<span class="property">person</span>)</span></span><br><span class="line"><span class="language-javascript"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br></pre></td></tr></table></figure>
<h2 id="子传父"><a href="#子传父" class="headerlink" title="子传父"></a>子传父</h2><blockquote>
<p><strong>父组件</strong></p>
</blockquote>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">setup</span>&gt;</span><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 引入子组件</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">import</span> <span class="title class_">Son</span> <span class="keyword">from</span> <span class="string">&#x27;./Son.vue&#x27;</span></span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> <span class="title function_">getSonData</span> = (<span class="params">sonData</span>) =&gt; &#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&quot;子组件传递的数据：&quot;</span>, sonData)</span></span><br><span class="line"><span class="language-javascript">&#125;</span></span><br><span class="line"><span class="language-javascript"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">template</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">div</span>&gt;</span></span><br><span class="line">    <span class="comment">&lt;!-- 可以传入上面定义的参数 --&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">son</span> @<span class="attr">get-son-data</span>=<span class="string">&quot;getSonData&quot;</span>/&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">template</span>&gt;</span></span><br></pre></td></tr></table></figure>
<blockquote>
<p><strong>子组件</strong></p>
</blockquote>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">setup</span>&gt;</span><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">import</span> &#123;ref&#125; <span class="keyword">from</span> <span class="string">&quot;vue&quot;</span>;</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> person = <span class="title function_">ref</span>(&#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="attr">name</span>: <span class="string">&quot;XiaoFei&quot;</span>,</span></span><br><span class="line"><span class="language-javascript">  <span class="attr">age</span>: <span class="number">18</span></span></span><br><span class="line"><span class="language-javascript">&#125;)</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 通过 defineEmits 编译器宏生成emit方法</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> emit = <span class="title function_">defineEmits</span>([<span class="string">&#x27;get-son-data&#x27;</span>])</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> <span class="title function_">sentMsg</span> = (<span class="params"></span>) =&gt; &#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="comment">// 触发自定义函数 向父组件传输数据</span></span></span><br><span class="line"><span class="language-javascript">  <span class="title function_">emit</span>(<span class="string">&#x27;get-son-data&#x27;</span>, person)</span></span><br><span class="line"><span class="language-javascript">&#125;</span></span><br><span class="line"><span class="language-javascript"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">template</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">button</span> @<span class="attr">click</span>=<span class="string">&quot;sentMsg&quot;</span>&gt;</span>点击后，向父组件传递数据<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">template</span>&gt;</span></span><br></pre></td></tr></table></figure>
<h2 id="跨组件"><a href="#跨组件" class="headerlink" title="跨组件"></a>跨组件</h2><blockquote>
<p><strong><code>provide</code>和<code>inject</code>实现跨组件间的任意通讯</strong></p>
<p><strong>如果传递的是方法，方法中有修改传递数据组件中的数据，接收方法的组件拿到该函数也会修改传递数据组件中的数据</strong></p>
</blockquote>
<ul>
<li><p>传递数据组件</p>
  <figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">setup</span>&gt;</span><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">import</span> <span class="title class_">Son</span> <span class="keyword">from</span> <span class="string">&#x27;./Son.vue&#x27;</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">import</span> &#123;provide, ref&#125; <span class="keyword">from</span> <span class="string">&quot;vue&quot;</span>;</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 需要传递的对象参数</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> user = <span class="title function_">ref</span>(&#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="attr">username</span>: <span class="string">&quot;123456&quot;</span>,</span></span><br><span class="line"><span class="language-javascript">  <span class="attr">password</span>: <span class="string">&quot;223456&quot;</span></span></span><br><span class="line"><span class="language-javascript">&#125;)</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 需要传递的方法</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> <span class="title function_">testMethod</span> = (<span class="params"></span>) =&gt; &#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&quot;传递测试方法&quot;</span>)</span></span><br><span class="line"><span class="language-javascript">&#125;</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 跨组件传递数据</span></span></span><br><span class="line"><span class="language-javascript"><span class="title function_">provide</span>(<span class="string">&#x27;user&#x27;</span>, user)</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 跨组件传递方法</span></span></span><br><span class="line"><span class="language-javascript"><span class="title function_">provide</span>(<span class="string">&#x27;testMethod&#x27;</span>, testMethod)</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">template</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">son</span> <span class="attr">ref</span>=<span class="string">&quot;sonRef&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">template</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>接收数据组件</p>
  <figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">setup</span>&gt;</span><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">import</span> &#123;inject&#125; <span class="keyword">from</span> <span class="string">&quot;vue&quot;</span>;</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 跨组件接收参数</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> user = <span class="title function_">inject</span>(<span class="string">&#x27;user&#x27;</span>)</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 跨组件接收方法</span></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> testMethod = <span class="title function_">inject</span>(<span class="string">&#x27;testMethod&#x27;</span>)</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 在script中使用跨组件接收的方法</span></span></span><br><span class="line"><span class="language-javascript"><span class="title function_">testMethod</span>()</span></span><br><span class="line"><span class="language-javascript"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">template</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">div</span>&gt;</span></span><br><span class="line">    <span class="comment">&lt;!-- 使用跨组件接收的参数 --&gt;</span></span><br><span class="line">    &#123;&#123; user &#125;&#125; <span class="tag">&lt;<span class="name">br</span>/&gt;</span></span><br><span class="line">    <span class="comment">&lt;!-- 在template中使用跨组件接收方法 --&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">button</span> @<span class="attr">click</span>=<span class="string">&quot;testMethod&quot;</span>&gt;</span>使用跨组件接收方法<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">template</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
</ul>
<h1 id="模版引用"><a href="#模版引用" class="headerlink" title="模版引用"></a>模版引用</h1><blockquote>
<p><strong>通过 ref 标识 获取真实的 dom 对象或者组件实例对象</strong></p>
</blockquote>
<h2 id="获取标签对象dom"><a href="#获取标签对象dom" class="headerlink" title="获取标签对象dom"></a>获取标签对象dom</h2><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">setup</span>&gt;</span><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">import</span> &#123;onMounted, ref&#125; <span class="keyword">from</span> <span class="string">&quot;vue&quot;</span>;</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> h1Ref = <span class="title function_">ref</span>(<span class="literal">null</span>)</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="comment">// 使用ref获取dom对象，需要在组件挂载完成之后才能获取</span></span></span><br><span class="line"><span class="language-javascript"><span class="title function_">onMounted</span>(<span class="function">() =&gt;</span> &#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="variable language_">console</span>.<span class="title function_">log</span>(h1Ref.<span class="property">value</span>)</span></span><br><span class="line"><span class="language-javascript">&#125;)</span></span><br><span class="line"><span class="language-javascript"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">template</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">h1</span> <span class="attr">ref</span>=<span class="string">&quot;h1Ref&quot;</span>&gt;</span>dom标签<span class="tag">&lt;/<span class="name">h1</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">template</span>&gt;</span></span><br></pre></td></tr></table></figure>
<h2 id="获取vue组件dom及使用testMessage获取组件属性"><a href="#获取vue组件dom及使用testMessage获取组件属性" class="headerlink" title="获取vue组件dom及使用testMessage获取组件属性"></a>获取vue组件dom及使用testMessage获取组件属性</h2><blockquote>
<p><strong>父组件使用ref获取到的vue组件的dom，默认情况下在 <code>script setup</code>语法糖下组件内部的属性和方法是不开放给父组件访问的，可以通过<code>defineExpose</code>编译宏指定哪些属性和方法容许访问</strong></p>
</blockquote>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">setup</span>&gt;</span><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">import</span> &#123;onMounted, ref&#125; <span class="keyword">from</span> <span class="string">&quot;vue&quot;</span>;</span></span><br><span class="line"><span class="language-javascript"><span class="keyword">import</span> <span class="title class_">Son</span> <span class="keyword">from</span> <span class="string">&#x27;./Son.vue&#x27;</span></span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="keyword">const</span> sonRef = <span class="title function_">ref</span>(<span class="literal">null</span>)</span></span><br><span class="line"><span class="language-javascript"></span></span><br><span class="line"><span class="language-javascript"><span class="title function_">onMounted</span>(<span class="function">() =&gt;</span> &#123;</span></span><br><span class="line"><span class="language-javascript">  <span class="variable language_">console</span>.<span class="title function_">log</span>(sonRef.<span class="property">value</span>)</span></span><br><span class="line"><span class="language-javascript">&#125;)</span></span><br><span class="line"><span class="language-javascript"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">template</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">son</span> <span class="attr">ref</span>=<span class="string">&quot;sonRef&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">template</span>&gt;</span></span><br></pre></td></tr></table></figure>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!--Son组件--&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">setup</span>&gt;</span><span class="language-handlebars"><span class="language-xml"></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars">import &#123;ref&#125; from &quot;vue&quot;;</span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars">const name = ref(&quot;XiaoFei&quot;)</span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"><span class="comment">&lt;!-- 当使用ref获取该组件的模板引用时，使用defineExpose指定哪些属性和方法容许访问 --&gt;</span></span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars">defineExpose(&#123;</span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars">  name</span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars">&#125;)</span></span></span><br><span class="line"><span class="language-xml"><span class="language-handlebars"></span></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">template</span>&gt;</span><span class="tag">&lt;/<span class="name">template</span>&gt;</span></span><br></pre></td></tr></table></figure>
<p>​    </p>
<h1 id="20231105-Vue3快速上手"><a href="#20231105-Vue3快速上手" class="headerlink" title="20231105-Vue3快速上手"></a>20231105-Vue3快速上手</h1><h2 id="项目创建"><a href="#项目创建" class="headerlink" title="项目创建"></a>项目创建</h2><p><img src= "" data-lazy-src="https://www.naste.top:9000/images/image-20231105211542773.png" alt="image-20231105211542773"></p>
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